CLIPHEIGHT="clipheight"

Specifies the height of a clip region in the default units, e.g.

CLIPHEIGHT="1200"

sets position to 2" using default of 1"/600.

Alternatively:

CLIPHEIGHT="clipheight units"

Height of the clip region in specified units, e.g.

CLIPHEIGHT="2 in"

sets position to 2", whatever units have been set up for use elsewhere.

INFO element sample script